Add EPUB alternative format.

Author: gkellogg

index.html

@@ -133,8 +133,8 @@
       // Team Contact.
       wgPatentURI:  "https://www.w3.org/2004/01/pp-impl/107714/status",
       processVersion: 2018,
-      maxTocLevel:            2
-      ///alternateFormats: [ {uri: "diff-20140116.html", label: "diff to previous version"} ]
+      maxTocLevel:            2,
+      alternateFormats: [ {uri: "json-ld11-api.epub", label: "EPUB"} ]
   };
 //]]>
 </script>